Red Hat Bugzilla – 1420880 – libvirt overwrites externally set vlan tags in macvtap passthrough VFs since 2.x so Nova needs to craft the XML to include vlan tag
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2017:1595